Hammer

A hammer comprising:

• a housing 2;
• a motor mounted within the housing;
• a tool holder 8 rotatably mounted on the housing 2 for holding a cutting tool;
• a striker 342;
• 924 mounted in a freely slideable manner within the housing, for repetitively striking an end of a cutting tool when a cutting tool is held by the tool holder 8, which striker is reciprocatingly driven by the motor, when the motor is activated, via a drive mechanism;
• wherein the drive mechanism comprises;
• a pivoting drive arm 355;
• 914 pivotally mounted within the housing 2 at one end;
• a pivotal drive mechanism connected to the pivoting drive arm 355;
• 914 which converts a rotary movement generated by the motor to a pivoting movement of the pivoting drive arm 355;
• 914 about its pivot point, the pivotal drive mechanism comprising a circular cam 358;
• 906 formed around the circumference of a length wise section of a rotatable shaft 347;
• 902 and a cam follower 354;
• 908 connected to the pivoting drive arm 355;
• 914 which engages with cam 358;
• 906 and follows the path of the cam 358;
• 906 when the shaft 347;
• 902 is rotated;
• characterised in that a spring 244;
• 344;
• 444;
• 844;
• 922 is further provided, one end of which is fixedly connected to an end, remote from the pivot point, of the pivoting drive arm 246;
• 355;
• 457, 857;
• 914 the other end being fixedly connected to the striker 342;
• 924.